// JavaScript Document
var tips;
var theTop = 240;
/*这是默认高度,越大越往下*/
var old = theTop;
function initFloatTips() {
    tips = document.getElementById('divQQbox');
    moveTips();
};
function moveTips() {
    var tt = 50;
    if (window.innerHeight) {
        pos = window.pageYOffset
    }
    else if (document.documentElement && document.documentElement.scrollTop) {
        pos = document.documentElement.scrollTop
    }
    else if (document.body) {
        pos = document.body.scrollTop;
    }
    pos = pos - tips.offsetTop + theTop;
    pos = tips.offsetTop + pos / 10;
    if (pos < theTop) pos = theTop;
    if (pos != old) {
        tips.style.top = pos + "px";
        tt = 10;
    }
    old = pos;
    setTimeout(moveTips, tt);
}
//!
initFloatTips();
function hideMsgBox(theEvent) { //theEvent用来传入事件，Firefox的方式
    if (theEvent) {
        var browser = navigator.userAgent; //取得浏览器属性
        if (browser.indexOf("Firefox") > 0) { //如果是Firefox
			if (document.getElementById('divOnline').contains(theEvent.relatedTarget)) { //如果是子元素
                return; //结束函式
            }
        }
        if (browser.indexOf("MSIE") > 0) { //如果是IE
            if (document.getElementById('divOnline').contains(event.toElement)) { //如果是子元素
                return; //结束函式
            }
        }
    }
    /*要执行的操作*/
}
<!-- wpa button end --> 